CN103952986B - A kind of off-load formula rigid culvert structure - Google Patents
A kind of off-load formula rigid culvert structure Download PDFInfo
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- CN103952986B CN103952986B CN201410214006.9A CN201410214006A CN103952986B CN 103952986 B CN103952986 B CN 103952986B CN 201410214006 A CN201410214006 A CN 201410214006A CN 103952986 B CN103952986 B CN 103952986B
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Abstract
The present invention relates to geotechnical engineering and highway construction technical field, specifically disclose a kind of off-load formula rigid culvert structure, it comprises basis, culvert side wall and culvert top board, also comprises off-load block, off-load hole; Off-load block is positioned at directly over culvert side wall, and off-load block and culvert side wall are an overall structure; Off-load hole is directly over culvert between two off-load blocks; Light flexible material is filled in off-load hole; After culvert of the present invention adopts said structure, constructing operation is easy, is easy to realize; Substantially reduce and contain top soil pressure, efficiently solve culvert cracking phenomena; Culvert top loading carries a part and is delivered in surrounding soil by the soil arching effect containing top, and another part is delivered on basis by culvert side wall, has given full play to the vertical anti-pressure ability of culvert side wall; Effectively reduce the maximal bending moment of culvert side wall, make culvert distribution of force more reasonable; Effectively reduce the stressed asymmetry of culvert, avoid and contain top is separated cracking phenomenon with side wall junction; Off-load effect is significantly improved.
Description
Technical field
The present invention relates to geotechnical engineering and highway construction technical field, be specifically related to a kind of off-load formula rigid culvert structure.
Background technology
On highway culvert, overburden soil thickness is general higher, and especially the high filling section of mountainous area highway, culvert covers more than the 10m that is everlasting that bankets, and some section is even more than 50m.Because filled load is larger, the topographic and geologic situation in some area is complicated and changeable in addition, stressed and the deformation behaviour of culvert is often comparatively complicated, there is stress and concentrate in culvert body, and the problem such as the differential settlement of structure, easily cause various disease in various degree, have saying of " ten contain nine splitting " at engineering circles.These diseases gently then cause that culvert ftractures, seepage or ponding, heavy then cause culvert structure to destroy, and even occur collapsing, have a strong impact on the normal use of highway.
In order to reduce the soil pressure that culvert bears, need to take necessary off-load measure to it.At present, the off-load measure for culvert has multiple, and some off-load measures are higher for construction technical requirement, waste time and energy, more difficult realization, once misoperation in work progress, just can affect off-load effect; Some off-load measure costs are higher, should not promote.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of off-load formula rigid culvert structure, the off-load successful of this structure and easy construction, cheap.
In order to realize foregoing invention object, the present invention takes following technical scheme.
A kind of off-load formula rigid culvert structure, comprises basis, culvert side wall and culvert top board, it is characterized in that: also comprise off-load block and off-load hole, light filling flexible material in described off-load hole;
Described basis, culvert side wall, off-load block and culvert top board are steel concrete or plain concrete material.
Described off-load block is arranged at directly over culvert side wall top, and described off-load block and culvert side wall are an overall structure;
The width of described off-load block is identical with the culvert side wall top thickness immediately below it, and the length of off-load block is identical with the length of culvert side wall;
The height of described off-load block is the 1/20-1/5 of culvert overall width (i.e. off-load hole width and two off-load block width sums).
The height of described off-load block refers to the vertical distance at culvert cover top surface and off-load block top, and in prior art, culvert side coping is generally concordant with the upper surface of culvert top board.
Described off-load hole is positioned at directly over culvert top board, is the open cavity surrounded by culvert top board and two off-load blocks;
The filling thickness of described light flexible material equals the degree of depth in off-load hole;
Wherein, light flexible material can be EPS plate (polystyrol plastic foam plate material), damaged tire bar mix light-textured soil or EPS beads-mixed lightweight soil etc., also can fill with roadway excavation soil out;
Light flexible material in order to make to banket in culvert side, in off-load block and off-load hole produces the differential settlement of expection, to reach the off-load object of expection, the density of selected light flexible material is necessarily less than the density of banketing outside culvert side wall, simultaneously cause pavement destruction in order to avoid the relative settlement of the end face that bankets is excessive, the density of described light flexible material comprehensively will be analyzed according to the attribute of light flexible material, height of embankment and culvert specification and determine.
The preferred technical scheme of the present invention is:
Be filled with on the basis of light flexible material in described off-load hole, above described off-load hole, straight making has muscle material, and the two ends of described muscle material are anchored at off-load block top outer edge;
Described muscle material is high-strength earth work grille or gauze wire cloth, and described muscle material meets the condition that extensional rigidity is not less than 1200kN/m; The mesh of described muscle material and steel wire diameter meeting under above-mentioned tension condition, will be determined according to muscle material type and the depth of fill.
Described culvert is box culvert or slab culvert.
In off-load formula rigid culvert structure of the present invention, basis, culvert side wall, culvert top board, off-load block, off-load hole and light flexible material form an off-load system, the soil arching effect that the stiffness difference banketed by off-load block and light flexible material, culvert both sides is formed, a part of embankment filled soil load is made to be passed to culvert side wall, and be passed to basis along side wall, another part load is transferred in surrounding soil by containing top soil arching effect, reach the effect reducing to contain top soil pressure, make culvert side wall maximal bending moment reduce simultaneously.Further, when reinforcement, due to the Membrane of Tensile Buildings effect of muscle material, soil filled on the top of culvert load transfer can be made on off-load block, reach the effect reducing to contain top soil pressure further.
After the present invention adopts said structure, culvert off-load Be very effective improves, and effectively alleviates culvert cracking phenomena; Culvert top loading carries and is passed to ground by culvert side wall, again due to the tension film effect of muscle material, reduces and contains the suffered soil pressure in top, reduce culvert side wall maximal bending moment simultaneously and culvert side wall cracking phenomena is significantly alleviated; Effectively alleviate complicated landform and geological conditions to the impact of culvert force and deformation; Effectively reduce the stressed asymmetry of culvert, avoid culvert top board and be separated cracking phenomena with culvert side wall junction.
Accompanying drawing explanation
Fig. 1 is the generalized section of a kind of off-load formula rigid culvert structure of the present invention.
Fig. 2 is a kind of off-load formula rigid culvert structural representation of embodiment 2.
Fig. 3 is the culvert model structure schematic diagram carrying out numerical simulation contrast off-load effect, and in figure, (a) is the general slab culvert without off-load measure; B () is only lay the slab culvert of light flexible material as off-load measure; C () is slab culvert described in this manual embodiment 1; D () is slab culvert described in this manual embodiment 2.
In figure: 1-ground, 2-basis, 3-culvert side wall, 4-culvert top board, 5-off-load block, 6-off-load hole, 7-muscle material, 8-light flexible material.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, invention is described in detail.
Embodiment 1:
As shown in Figure 1, a kind of off-load formula rigid culvert structure, described culvert is slab culvert, comprises basis 2, culvert side wall 3 and culvert top board 4, also comprises off-load block 5 and off-load hole 6, light filling flexible material 8 in described off-load hole 6;
Described basis, culvert side wall, off-load block and culvert top board are steel concrete or plain concrete material.
Described off-load block 5 is positioned at directly over culvert side wall 3 top, and is an overall structure with culvert side wall 3;
Length, the width of described off-load block are all consistent with the culvert side wall immediately below it;
Described off-load hole 6 is positioned at directly over culvert top board 4, is the open cavity surrounded by culvert top board 4 and two off-load blocks 5;
The degree of depth in off-load hole 6 is equal with the height of off-load block 5, and the width in off-load hole 6 is equal with the width of culvert top board 4.
Described light flexible material can be EPS plate (polystyrol plastic foam plate material), damaged tire bar mix light-textured soil, EPS beads-mixed lightweight soil etc., also can fill with roadway excavation soil out;
The density of described light flexible material 8 is less than the density of banketing outside culvert side wall, specifically comprehensively will determine according to the attribute of light flexible material 8, height of embankment and culvert specification.
The filling thickness of described light flexible material equals the degree of depth in off-load hole.
In above-mentioned culvert structure, basis 2, culvert side wall 3, culvert top board 4, off-load block 5, off-load hole 6 form an off-load system, by off-load block 5 and both sides banket formed soil arching effect, most of embankment filled soil load is made to be passed to culvert side wall 3, reach ground 1 again, and reducing moment of flexure suffered by culvert side wall 3, a part of load is transferred in surrounding soil by containing top soil arching effect in addition.
The concrete building process of the off-load formula rigid culvert structure of the present embodiment is as follows:
The first step, according to design specifications, Ground Treatment 1 and water underpin 2;
Second step, when building culvert side wall 3, simultaneously builds off-load block 5 according to designing requirement, and on off-load block 5 (top outer edge) pre-buried anchor bar;
3rd step, according to design specifications, builds culvert top board 4;
4th step, culvert both sides require railway embankment using material according to related specifications and carry out compaction treatment, fill to highly equal with off-load block 5;
5th step, contains off-load hole 6, top and fills light flexible material 8 and banket to fill with culvert both sides and carry out simultaneously, do appropriate compacting process or do not do compaction treatment when the light flexible material 8 directly over culvert top board 4 fills according to the character of light flexible material 8.
6th step, requires successively railway embankment using filler according to related specifications again.
According to Fig. 1, analyze the present invention from load transfer mechanism.
When embankment loading is on load-relieving structure, owing to banketing and the light flexible material 8 in off-load hole 6 and the stiffness difference of culvert side wall off-load block 5 in culvert both sides, cause to banket in culvert side wall 3 both sides, the relative settlement of off-load hole 6 and off-load block 5, the sedimentation of light flexible material 8 is greater than culvert both sides and bankets and the sedimentation of off-load block 5, thus soil arching effect is formed above culvert top board 4, making culvert top loading carry a part transfers in surrounding soil, another part load is passed to basis 2 by culvert side wall 3, makes to contain top soil pressure and reduces.Culvert side wall 3 and off-load block 5 are subject to the horizontal stress effect of both sides embankment filled soil simultaneously, because culvert side wall 3 and off-load block 5 are an overall structure, again due to the supporting role of culvert top board 4, the horizontal force of culvert side wall 3 and off-load block 5 is similar to the stressed of overhanging beam, contrast with the culvert structure without off-load block, this structure makes the maximal bending moment suffered by culvert side wall 3 reduce.Adopt culvert structure of the present invention, given full play to the vertical anti-pressure ability of culvert side wall 3, reached the object of off-load, turn reduced maximal bending moment suffered by culvert side wall 3 simultaneously, make culvert stressed more reasonable.
Embodiment 2:
As shown in Figure 2, a kind of off-load formula rigid culvert structure, this culvert structure, mainly on the basis of embodiment 1, increases and has laid muscle material.Fill after off-load hole 6 completes at light flexible material 8, above off-load hole, lay a layers of reinforcement material 7, muscle material 7 both sides are anchored in the outer rim of off-load block 5 top, and the extensional rigidity of muscle material 7 is not less than 1200kN/m, want straight making when laying; Owing to adding the tensile membrane effect of muscle material, make culvert side wall 3 top be subject to a pulling force internally shunk, maximal bending moment suffered by culvert side wall 3 is reduced, effectively reduces the impact of embankment filled soil on culvert side wall 3 force and deformation feature.In addition, muscle material 7 produces deflection deformation under filled load effect, and the muscle material 7 be anchored on off-load block 5 by two ends is transferred to the filled load above culvert on culvert side wall 3, thus reaches the object reducing to contain top soil pressure further.
Its off-load effect is higher than culvert structure shown in embodiment 1.
Embodiment 1 and the off-load culvert structure numerical simulation software of embodiment 2 are carried out analogue simulation analysis, and with without off-load measure general slab culvert and to lay light flexible material 8 and be analyzed as the slab culvert (without off-load block) of off-load measure.
Be 20m according to the culvert model depth of fill that embodiment 1 is set up, culvert is slab culvert, culvert height 4.0m, culvert clear span width 4.0m, overall width (i.e. off-load hole width and two off-load block width sums) is 6.0m, culvert side wall thicknesses is 1.0m, and culvert top plate thickness is 0.5m, and off-load tile height is 0.5m.The light flexible material filled is mix light-textured soil, and its density is 1.6g/m3, and modulus of elasticity is 0.2MPa, and poisson's ratio is 0.4, its filling-up thickness i.e. 0.5m equal to off-load hole height.Embankment filled soil modulus of elasticity is 30MPa, and poisson's ratio is 0.32, and density is 1.8g/m3.The culvert model of embodiment 2, on the basis of embodiment 1, lays muscle material above off-load hole, and muscle material uses high-strength earth work grille, and the extensional rigidity of muscle material is 1200kN/m.The size of the general culvert model without off-load measure set up is identical with embodiment 1, does not just have off-load block and does not lay light flexible material.The slab culvert moulded dimension of only laying light flexible material set up is identical with embodiment 1, the light flexible material used and its thickness also identical, just there is no off-load block.Embodiment 1, embodiment 2 Numerical results are analyzed with the general slab culvert without off-load measure, analysis result shows, the present embodiment 1, embodiment 2 reduce 62%, 65% than without off-load measure general slab culvert culvert top soil pressure respectively, and culvert side wall maximal bending moment reduces 6%, 9% respectively.Using embodiment 1, embodiment 2 Numerical results and only lay the slab culvert of light flexible material as off-load measure and be analyzed, analysis result shows, the present embodiment 1, embodiment 2 contain top soil pressure reduction 21%, 23% than only laying the slab culvert of light flexible material as off-load measure respectively, and culvert side wall maximal bending moment reduces 20%, 23% respectively.It can thus be appreciated that adopt culvert structure of the present invention, its off-load effect is more obvious, makes culvert stressed more reasonable.
Above-mentioned detailed description of the invention is the preferred embodiments of the present invention; be not for limiting enforcement of the present invention and right; all equivalences of working it out according to content described in patent application protection domain of the present invention change and modify, and all should be included in patent claim of the present invention.
Claims (4)
1. an off-load formula rigid culvert structure, comprises basis, culvert side wall and culvert top board, it is characterized in that: also comprise off-load block and off-load hole, light filling flexible material in described off-load hole;
Described off-load block is arranged at directly over culvert side wall top, and described off-load block and culvert side wall are an overall structure;
The width of described off-load block is identical with the culvert side wall top thickness immediately below it, and the length of off-load block is identical with the length of culvert side wall;
Described off-load hole is positioned at directly over culvert top board, is the open cavity surrounded by culvert top board and two off-load blocks;
Above described off-load hole, straight making has muscle material, and the two ends of described muscle material are anchored at off-load block top outer edge;
Described muscle material is high-strength earth work grille or gauze wire cloth, and described muscle material meets the condition that extensional rigidity is not less than 1200kN/m;
The height of described off-load block is the 1/20-1/5 of culvert overall width;
The filling thickness of described light flexible material equals the degree of depth in off-load hole.
2. off-load formula rigid culvert structure according to claim 1, is characterized in that: described culvert is box culvert or slab culvert.
3. off-load formula rigid culvert structure according to claim 1 and 2, is characterized in that: described light flexible material is EPS plate, damaged tire bar mix light-textured soil, EPS beads-mixed lightweight soil or roadway excavation soil out.
4. off-load formula rigid culvert structure according to claim 1 and 2, is characterized in that: the density of described light flexible material is less than the density of banketing outside culvert side wall.
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| CN201410214006.9A CN103952986B (en) | 2014-05-19 | 2014-05-19 | A kind of off-load formula rigid culvert structure |
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| CN201410214006.9A CN103952986B (en) | 2014-05-19 | 2014-05-19 | A kind of off-load formula rigid culvert structure |
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| CN103952986B true CN103952986B (en) | 2016-04-13 |
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| CN107012803B (en) * | 2017-06-01 | 2022-07-29 | 湖北工业大学 | Control method and structure for load shedding and creep prevention of high-fill culvert |
| CN107152034B (en) * | 2017-06-02 | 2023-10-10 | 中交四航工程研究院有限公司 | Comprehensive pipe rack and construction method thereof |
| CN109137764B (en) * | 2018-07-24 | 2020-09-29 | 华东交通大学 | Prefabricated assembly device for rapidly improving bearing capacity of culvert and culvert reinforcing method |
| CN109208494B (en) * | 2018-10-16 | 2020-12-22 | 湖南省交通规划勘察设计院有限公司 | Add arched bridge and culvert structure of muscle steel buckled plate |
| CN109372013B (en) * | 2018-10-25 | 2021-06-04 | 南京吉欧地下空间科技有限公司 | Comprehensive pipe gallery on soft foundation filled with EPS (expandable polystyrene) mixed soil and construction method |
| CN110172930B (en) * | 2019-05-29 | 2023-08-18 | 中信国安建工集团有限公司 | Assembling method of prefabricated reinforced concrete culvert cover plate |
| CN110439007B (en) * | 2019-07-31 | 2021-08-03 | 湖北工业大学 | Pile plate U-shaped supporting and retaining load reduction structure and construction process |
| CN114892554B (en) * | 2022-06-21 | 2023-10-03 | 湖北工业大学 | Pavement structure of road culvert |
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Inventor after: Chen Baoguo Inventor after: Song Dingbao Inventor after: Jiao Junjie Inventor after: He Yuheng Inventor before: Chen Baoguo Inventor before: Song Dingbao Inventor before: Jiao Junjie |
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